On the IceCube Result on $\bar{\nu}_{\mu} \to \bar{\nu}_{s}$ Oscillations

TL;DR

This paper explains how Earth-core crossing neutrinos experience enhanced oscillations from muon anti-neutrinos to sterile anti-neutrinos at small mixing angles, clarifying the IceCube experiment's recent findings.

Contribution

It provides a detailed mechanism for the enhancement of sterile neutrino oscillations in Earth-core-crossing neutrinos, supporting the interpretation of IceCube's results.

Findings

Enhanced $ar{ u}_{ m ext{mu}} o ar{ u}_{ m s}$ oscillations at small mixing angles.

Clarification of the Earth matter effect on neutrino oscillations.

Consistency with IceCube's recent observations.

Abstract

We elucidate the mechanism of enhancement of the $\bar{\nu}_{\mu} \to \bar{\nu}_{s}$ transitions at small mixing angles of Earth-core-crossing neutrinos, which is at the basis of the recent result of the IceCube experiment on atmospheric muon anti-neutrino oscillations into sterile anti-neutrino.